When changing the volume during an incoming call, the Sound stops completely.
I have updated to kola nut in December 2014. Perhaps that is the reason for this error (amongst other Errors I hadn’t bevore)
This isn’t a bug. You are silencing the ringer by doing this.
If you wish to change the volume of your ringer, go to Settings > Audio Profiles > Settings (against the General Profile) and then Volumes
Oh, thanks a lot. Then the “bug” has been “between my own ears”. I surely should have known that.
not to worry. No question is silly when you don’t know 
GREAT!!! Thanks! 
I was driving crazy looking for a way to silence the ringer during an incoming call! 
I tried putting the phone face down (as I did with my previous Nokia) and clicked almost everywhere on the screen but didn’t think at the “obvious” volume buttons
Thank you very much!
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Just for the record, there is a Flip action while ringing setting in GravityBox (under Phone tweaks). You can choose between Do nothing, Mute ringer and Dismiss call.
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Thanks! Good to know!